1975-01-27
1976-09-28
Olms, Douglas W.
H04B 346
Patent
active
039833402
ABSTRACT:
An automatic span line switch for PCM communication lines is disclosed which isolates alarm conditions to an actual span line failure, as distinguished from failures in the terminal equipment. In addition, the switch uses a specific code transmission to provide fast switching and to permit identification of the direction of failure. Although the circuit is capable of switching span segments individually and independently, it can transmit an alarm to a distant central office and automatically establish an appropriate test loop in the presence of test transmissions when needed to permit single-end troubleshooting. The switch further tests the dead line continuously and stringently for error-free data transmission, and automatically resets without disturbing traffic when the trouble has been corrected. An extremely flexible priority system for selected channels is also provided, and the circuitry on both ends of all channels (including the protective channel) is identical to minimize parts inventory costs.
REFERENCES:
patent: 2680162 (1954-06-01), Brehm et al.
patent: 2827516 (1958-03-01), Morris
patent: 2889408 (1959-06-01), Trousdale
patent: 3061685 (1962-10-01), Peach
patent: 3275749 (1966-09-01), Kunihiro et al.
patent: 3281536 (1966-10-01), Dupieux et al.
patent: 3317675 (1967-05-01), Harris et al.
patent: 3364467 (1968-01-01), Haibt et al.
patent: 3493683 (1970-02-01), Schlichte
patent: 3603736 (1971-09-01), Morroll
patent: 3715503 (1973-02-01), Jungbluth et al.
patent: 3864533 (1975-02-01), Erlund
patent: 3865991 (1975-02-01), Charransol et al.
Lima Paul J.
Townsend Todd V.
Lynch Communication Systems, Inc.
Olms Douglas W.
LandOfFree
Automatic span line switch does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Automatic span line switch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic span line switch will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2081861